Tattoo test bed: Quaternius v3-v6 bakes + Lena pipeline (bake, de-mirror, re-UV, viewers)

Session 2026-07-23/24 additions on top of the existing Quaternius bed:
- bake_lena.gd: 6-piece bake on QuatSkin Lena (chiefs-mark/iron-spine arms,
  voyagers/storm-bearer legs, star-eye chest, hearth-warmth back); global-axis
  wrap frame + 3cm junction blend kill the elbow split line
- demirror_lena.gd: tri-level split of mirror-shared limb UVs (arms 100%->0%,
  legs 99%->5% crotch-only residual)
- reuv_lena.gd: Quaternius-style semantic re-UV (16 islands, cylinder limbs +
  cylinder head/torso with planar caps) + texture transfer; fixes armpit/chin/
  cheek planar smears; single 4096 atlas, per-side tattoos native
- main_lena / anim_lena viewers (18 UAL clips, U light toggle) + probes + shots

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

bones.gd

@@ -0,0 +1,26 @@
+# Dumps all bone names + rest origins of the Quaternius Regular Male skeleton.
+extends SceneTree
+
+const GLTF_PATH := "C:/Users/CAN/tinqs-ltd/ariki-game/assets/quaternius/source-models/Regular_Male_FullBody.gltf"
+
+func _init() -> void:
+	var doc := GLTFDocument.new()
+	var state := GLTFState.new()
+	if doc.append_from_file(GLTF_PATH, state) != OK:
+		push_error("GLTF load failed")
+		quit(1)
+		return
+	var scene := doc.generate_scene(state)
+	var stack: Array = [scene]
+	while not stack.is_empty():
+		var n: Node = stack.pop_back()
+		if n is Skeleton3D:
+			var skel: Skeleton3D = n
+			for i in skel.get_bone_count():
+				var o := skel.get_bone_global_rest(i).origin
+				print("%s  (%.3f, %.3f, %.3f)" % [skel.get_bone_name(i), o.x, o.y, o.z])
+			quit()
+			return
+		for c in n.get_children():
+			stack.push_back(c)
+	quit(1)